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Correlation between vibrational modes, crystal structures, and dielectric properties of (1 − x)Ba(Mg1/3Ta2/3)O3–xBa(Co1/3Nb2/3)O3 ceramics

Published online by Cambridge University Press:  06 August 2018

Jianzhu Li ,
Liang Fang ,
Guoxiang Zhao ,
Chao Xing ,
Hengyang Qiao ,
Huiling Chen ,
Qi Zeming ,
Qing Wang  and
Feng Shi
Jianzhu Li
Affiliation:
School of Material Science & Engineering, Shandong University of Science and Technology, Qingdao 266590, People’s Republic of China
Liang Fang
Affiliation:
College of Materials Science & Engineering, Guilin University of Technology, Guilin 541004, People’s Republic of China
Guoxiang Zhao
Affiliation:
School of Material Science & Engineering, Shandong University of Science and Technology, Qingdao 266590, People’s Republic of China
Chao Xing
Affiliation:
School of Material Science & Engineering, Shandong University of Science and Technology, Qingdao 266590, People’s Republic of China
Hengyang Qiao
Affiliation:
School of Material Science & Engineering, Shandong University of Science and Technology, Qingdao 266590, People’s Republic of China
Huiling Chen
Affiliation:
School of Material Science & Engineering, Shandong University of Science and Technology, Qingdao 266590, People’s Republic of China
Qi Zeming
Affiliation:
National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, People’s Republic of China
Qing Wang
Affiliation:
School of Material Science & Engineering, Shandong University of Science and Technology, Qingdao 266590, People’s Republic of China
Feng Shi*
Affiliation:
School of Material Science & Engineering, Shandong University of Science and Technology, Qingdao 266590, People’s Republic of China
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

(1 − x)Ba(Mg1/3Ta2/3)O3–xBa(Co1/3Nb2/3)O3 (BMT–BCN, x = 0.0, 0.20, 0.25, 0.30, 0.40) ceramics were prepared using the traditional solid-state reaction method. X-ray diffraction patterns have shown that the intensities of (001) and (100) super-lattices decrease with the increase in the BCN content. Seven main Raman vibrational modes are observed, assigned, and illustrated, in particular. Raman shifts of Eg(O) modes and the FWHM values of F2g(O)/A1g(O) modes have close relationship with the dielectric properties. The calculated values by the four-parameter semiquantum model based on IR reflectivity match well with the measured data (@3.8 GHz), which means that most of dielectric contribution to the system may be ascribed to the absorption of structural phononic oscillations at the infrared region, and the contribution from the scattering of the defective phonons is small. The contributions of each vibrational mode on the dielectric responses were investigated in detail, indicating that the low-frequency modes (A2u(1) and Eu(1)) have a decisive role to the dielectric properties.

Keywords

ceramicsvibrational modescrystal structuresdielectric propertiesrelationship of structure–properties
Type
Article
Information
Journal of Materials Research , Volume 33 , Issue 23 , 14 December 2018 , pp. 4071 - 4079
Copyright
Copyright © Materials Research Society 2018 

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